A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 5950-01-090-0362
NSN 6135-01-517-6060
NSN 6220-00-212-9098
NSN 5945-00-906-1104
NSN 6105-00-509-8491
NSN 5930-00-084-4309
NSN 6130-01-413-5186
NSN 5925-01-254-2578
NSN 5990-00-147-3144
NSN 2925-01-018-1348
NSN 5935-01-205-0162
NSN 6145-00-964-8859